JP2585850Y2 - Electrical equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device for housing electric parts in a case.

[0002]

2. Description of the Related Art In an electric device in which an electric component is housed and an electromagnetic shield and waterproof and damp proof are provided for the electric component, the electric component is housed in an inner case having a function of an electromagnetic shield. 2. Description of the Related Art A case is filled with a sealing resin for sealing an electric component, and the inner case is housed in an outer case. One example of such an electrical device is a rain sensor. The conventional structure of this rain sensor will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a rain sensor mounted on a hood 2 of an automobile. Rain sensor 1
Has an outer case 3 and a pair of LED (light emitting diode) and PD for detecting rain 6 inside.
(Photodiode). This LED, PD
Is mounted on the surface of the inner case 7 and forms an optical path 5 in the recess 4 of the outer case 3. Inner case 7
Accommodates an electric component 9 arranged on the substrate 8. The outer case 3 is formed of a material that transmits light emitted from the LED.

[0004] The inner case 7 is made of a material such as iron for electromagnetically shielding the internal electric parts 9. For this reason, the inner case 7 may rust due to water that has entered the outer case 3. The bottom of the outer case 3 is sealed with a rubber lid 20 to prevent water from entering the inside. When the rain sensor 1 is used, the rubber cover 20
Adhesively fixed on top. Outer case 3, LED, PD
Between them, a ring-shaped rubber 12 is provided as a sealing material for waterproofing and moisture-proofing the LED and PD.

In such a structure, since the outer case 3 is sealed by the rubber lid 20, water does not enter the outer case 3 in a normal state, but a strong water flow such as a car wash is applied. In such a case, water may enter the outer case 3, causing rust in the inner case 7. Also, an LED that is mounted outside the inner case and is not sealed by the sealing resin 16,
The PD must be provided with seals 21 and 22 for waterproofing and moistureproofing, respectively, in case water enters.

Next, a manufacturing process of the above-described rain sensor 1 will be described with reference to FIGS. The rain sensor 1 is assembled upside down during the manufacturing process. FIG. 4 shows a state where the rain sensor 1 of FIG. 3 is assembled. When assembling, first, LEDs and PDs are attached to the lower surface of the inner case 7, and the LEDs and PDs themselves are sealed with seals 21 and 22. Although not shown, the inner case 7 and the LED,
The space between the PDs is also sealed with a sealing resin.

In this state, the substrate 8 to which the electric components 9 are attached
Is housed in the inner case 7, and the electrical connection 15 between the LED, PD and the substrate 8 is made. Thereafter, the sealing resin 16 is filled in the inner case 7, and the electric component 9 is sealed. Then, in this state, the inner case 7 is fixed to the outer case 3 with the screws 23. As described above, a ring-shaped rubber 12 is provided at a portion where the LED and the PD face the outer case 3.

FIG. 5 shows a state where the rain sensor 1 is assembled by a manufacturing process different from that shown in FIG. Explaining this manufacturing process, similarly to the example of FIG. 4, the LED and PD are attached to the inner case 7, and the LEDs and PD are sealed 21 and 22. In this state, the inner case 7 is caulked and fixed by the projections 10 provided on the outer case 3. Thereafter, the substrate 8 to which the electric components 9 are attached is attached to the inner case 7, and the electrical connection 15 between the LED and the PD is made. Thereafter, the sealing resin 16 is filled in the inner case 7, and the electric component 9 is sealed. Finally, the outer case 3 is covered with a lid, and a seal 25 is provided between the outer case 3 and the lid.

[0009]

In the above-described conventional electric device, waterproofness and moistureproofness are incomplete such that the inner case is easily rusted. Also, the manufacturing process is complicated and time-consuming, such that the seal must be performed several times. On the other hand, the present invention aims at making the electric device having the outer case and the inner case easy to manufacture and completely waterproof and moisture-proof, and also aims at reinforcing the adhesion between the outer case and the inner case. Things.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an inner case in which an electric component is housed inside and another electric component is mounted outside, and an outer case in which the inner case is housed inside. in the electric apparatus having a, a hole provided in the inner case, the inner
-With the case stored in the outer case,
A sealing resin for sealing the inside of the outer casing, through a hole provided in the inner case, and filling the space between the inside outer and outer case of the inner and the inner case of the inner case, which is housed inside the inner case co When sealing the electrical components mounted on the electrical components and external
Next, fix the inner case to the outer case.
That so.

[0011]

According to the above configuration, the sealing of the electric components housed inside the inner case and the electric components mounted outside the inner case can be completed by a single filling of the sealing resin. Also, the inner case is
Firmly fixed to the base. Further, the case of the electric device is completely waterproof and dampproof.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric device according to the present invention will be described with reference to FIGS. FIG. 1 shows a usage state of the rain sensor 1. As shown in FIG. 1, the rain sensor 1 is used by being attached to a hood 2 of an automobile. The light emitted by the LED is projected onto the PD through the depression 4 provided in the outer case 3 formed of a material that transmits the light.

When rain and snow 6 fall, rain and snow 6 pass through the optical path 5 between the LED and the PD, so that the light in the optical path 5 is scattered and the amount of light received by the PD is smaller than in a normal case. I do. By monitoring the change in the amount of light received by the PD with an electronic circuit constituted by the electric components 9 disposed on the substrate 8 housed in the inner case 7, rainfall and snowfall are detected. The inner case 7 is formed of a material such as iron in order to perform electromagnetic shielding on the electric components 9 housed therein.

Next, a manufacturing process of the rain sensor 1 will be described with reference to FIG. The rain sensor 1 is assembled upside down during the manufacturing process as shown in FIG. FIG. 2 shows a state where the rain sensor 1 is finally assembled. First, the rain sensor 1 has LEDs and PDs attached to the lower surface of the inner case 7. In this state, no seal is applied to the LED and PD.

In this state, the inner case 7 is attached to the outer case 3. A plurality of protrusions 10 are provided on the outer case 3, and a plurality of holes 11 corresponding to the protrusions 10 are provided on the lower surface of the inner case 7.
The protrusion 10 of the outer case 3 is the hole 1 of the inner case 7
1, the tip of the projection 10 is crushed by ultrasonic caulking, and the inner case 7 is fixed to the outer case 3.

In a state where the inner case 7 is fixed to the outer case 3, the LED and the PD are arranged to face each other via the depression 4 provided in the outer case 3. A ring-shaped rubber 12 is disposed between the outer case 3 and the LED and PD, and seals the light emitting surface and the light receiving surface of the LED and PD. The inner case 7 is provided with a hole 13 for passing a sealing resin, which will be described later, in addition to the hole 11 for passing the protrusion 10 of the outer case 3. Further, the outer case 3 is provided with a wall 14 that defines a space in which a sealing resin described later is filled.

With the inner case 7 fixed to the outer case 3 as described above, the board 8 on which the electric components 9 are mounted is stored and fixed in the inner case 7, and the board 8 and the LE 8
An electrical connection 15 between D and PD is made. Thereafter, the inner case 7 is filled with the sealing resin 16 by a dispenser. The sealing resin 16 flows out to the lower surface of the inner case 7 through the holes 13 provided in the inner case 7.

The sealing resin 16 that has flowed to the lower surface of the inner case 7 fills the space surrounded by the wall 14 inside the outer case 3 and seals the LED and PD. Further, the sealing resin 16 covers the outer surface of the inner case 7. Since the light path 5 of the LED and PD is surrounded by the ring-shaped rubber 12, the sealing resin 16 does not enter the light path 5 and hinder the operation of the rain sensor 1.

The sealing resin 16 is filled until it completely covers the electric components 9 housed in the inner case 7, and then solidified. According to the manufacturing process of the present embodiment described above, the electric components housed in the inner case 7 are sealed with a single filling of the sealing resin, and at the same time, the outer surfaces of the LED, PD and the inner case 7 are sealed. . This eliminates the need to perform the sealing of the LED and the PD itself and the sealing between the LED and the PD and the inner case 7 in a separate process as in the related art, thereby simplifying the manufacturing process.

At the same time, most of the outer surface of the inner case 7 is covered with the sealing resin 16, so that the inner case 7 is less exposed and rusted in the case. For this reason, the seal for waterproofing and moistureproofing for the outer case 3 may be very simple,
Only the simple lid 17 (FIG. 1) is needed. The entire inner case 7 may be covered with the sealing resin 16. Further, the sealing resin 16
Performs adhesion reinforcement between the outer case 3 and the inner case 7.

[0021]

According to the present invention, the electric device can be made completely waterproof and moisture-proof and can be obtained by a simple manufacturing process.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a use state of a rain sensor according to an embodiment of the present invention.

FIG. 2 is a sectional view for explaining a manufacturing process of the rain sensor of FIG. 1;

FIG. 3 is a cross-sectional view showing a usage state of a conventional rain sensor.

FIG. 4 is a sectional view for explaining a manufacturing process of the rain sensor of FIG. 3;

FIG. 5 is a cross-sectional view for explaining a manufacturing process of a conventional rain sensor different from FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rain sensor 3 ... Outer case 4 ... Depression 5 ... Optical path 6 ... Rain, snow 7 ... Inner case 8 ... Substrate 9 ... Electric parts 10 ... Protrusion 11, 13 ... Hole 12 ... Ring-shaped rubber 14 ... Wall 15 ... Electricity Connection 16: Sealing resin 17, 24: Lid 20: Rubber lid 21, 22: Seal LED: Light emitting diode PD: Photodiode

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 1-158650 (JP, U) JP-A 1-123349 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H05K 5/06 H05K 5/00

Claims (1)

(57) [Scope of request for utility model registration] 1. An electric device comprising: an inner case in which an electric component is housed inside and another electric component is mounted outside; and an outer case in which the inner case is housed. a hole provided in the case, the i
With the inner case stored in the outer case,
A sealing resin for sealing the inside of the outer casing, through a hole provided in the inner case, and filling the space between the inside outer and outer case of the inner and the inner case of the inner case, it is housed inside the inner case and when sealing the electrical components and the electrical components mounted on the outside
In both cases, fix the inner case to the outer case
An electric device characterized in that: